Grease-gun.



RgAsE GUN. V APPLICATION FILED NOV. l5. l9l5- RENEWED 'IUNE 12.21,236,232.`

E. R. THOMPSON.

l 9 T. Patented Aug. 7, 1917.

.E Z, T /zdmpongllv VEN TOR l WITNESSES.-y

ifomey 45 the accompanying drawings forming part UNITED STATES PATENToir-FICE...

EDWARD RAWSE THOMPSON, OF ST. LOUIS, MISSOURI, ASSIGNOR T0 ST. LOUIS TINda SHEET METAL WORKING soUnI. y

Specification of Letters Latent.

C0., OF ST. LOUIS, MISSOURI, A CDRIORATION OF LIIS-4 Patented Aug. 7,1917.

Application filed November 15, 1915, Serial No. 61,591. Renewed .Tune12, 1917. Serial No. 174,408.

To all whom it may Concern.'

Be it known that I EDWARD R. TrroivtrsoN, -a citizen of the UynitedStates, residing in St. Louis and State of Missouri, have 1nvented a newand useful Grease-Gun, of which the following is a s ecification.

This invention has re erence to grease guns and its object is to providea grease gun of such simple and inexpensive construction thateach guncharged with grease maybe sold in the charged condition Wlth the gunconstituting the contalner for the grease and after the expulsion of thegrease the gun may be discarded.

In accordance with the present invention there is provided an elongatedcyhndrlcal container orcasing of some sheet metal, such as sheet iron,with one end permanently i closed by a head, except for a small outletormallyclosed 'ceye a nozzle. v tainenis providedwith a plunger in the ba cap and designed to rellhe other end of the conform of a hollow metalbox permanently f5 closed throughout and snugly yet freely fittin 'thecasing and provi'ded with a periphera groove or seat for packmg whlchmay be in the form of a' pasteboard strip.' Such a head fits the casingsufficiently tight to hold the grease in the casing durlngtransportation, and when itis4 deslred to expel .the grease and the capat the other end of the gun has been replaced by a nozzle, pres sure isapplied to the plunger to force it toward the nozzle end'of the casing,thus 4expeiling the grease.

While in general action the container of A' the present invention issimilar to an ordinary grease gun, its construction and operation allowthe manufacture of the container at such a slight cost as to permlt thediscarding of the gun after it has been emp tied.V

The invention will be best understood 'from a consideration of thefollowing detailed description, taken in connection withof thisspecification, with the further understanding that While the drawingsshow a practica form 'of the invention, the latter 1s not eo fined toany strict conformity with the showing of the drawings, but may bechanged and modified so long as such changes and modifications comewithin the scope of the appended claim.

In-the drawings i a Figure l is rin-elevation of a grease'gunconstructed 'in accordance lwith the present 1nvention. i

Fig. 2 is a longitudinal, diametric section of the grease gun on alarger scale than Fig.

1, showing th'e plunger in elevation and the ,outlet nozzle in place.

section on the line 3-3 of' Fig. 3 is a Fig. 2.

Fig. 4 .is a perspective view of a packing strip for the plunger.

Referring to the drawings thereV is shownV i a casing or elongated canwhich in practical form may be about nine inches long and three inchesin diameter, such -a can when' supplied with parts to be describedholding two pounds of lubricating grease. Of

course, thev dimensions maybe varied as de,-

sired, since particular sizes have nothing to do with the presentinvention.

One end ofthecasing or can l, vwhich `is Acylindrical, throughout, ispermanently closed by a head 2 provided with a central Y nipple 3suitably threaded for the reception form of a cylinder about an inch in.axial I thickness, although any Vexact dimensions are immaterial. Theplunger 7 may be made of sheet metal, such as tin, of which metal A thehead 2 may be made. TheI plunger 7- is in the form of a shallow box;with both heads in place and where joining the sides ofthe box the headsare beaded circumferentially, as indicated' at 8, 9, respectively,

which beads lit the interior of the can 1' snugly, yet freely, land mayeven be made so as to not actuallycontact with the interior of the can,although in this respect it is not material whether the beads actu# allyengage the can or not. The side wall of the plunger between the beads,which side 'Y y 4wall 4is indleated at 10, is of less diameter than theinterior of the can or cesin 1 by a distanceequal to the-radialprojectlon of the beads beyond such side wall. Ada ted to thecircumferential channel-thus de ned scribed is -producible at en gun thenozzle 5 is screwed 3 aftertheremovaleof the receptacle-into whichbelivcen thc beads .is a strip ll. o I" suitable packing material. Inprac ice the paper material known as pasteliio'aml or Cardtu'iard orpulpboard of suitable thickness hasbecn found to fully answerthe'reqi1irements, and as certain. forms of pasteboard are quito hardand smooth and may be obtained in the proper thickness the strip 1'1 maybe formed of pasteboardofa length to have its ends; moet when extendingabout the plunger T in the channel 10 with the Width o-f- 'the strip l1about equal to the distance il etween the .beads 8 and 9. Under thesecircumstances the pasteboard .in its norma-l condition projects to aslight radial extent be youd the edges of the beads and tightijl engagesthe inner Walls ofthe casing or can l, the slight flare 6 of theentering end et' the -can facilitating the introdrwtion oi" the plunger.

vVith the cap 4 in place and the pluf f? removed the can l is readilyfilled with grease, two pounds of grease filling a can of the sizehereinbefore mentioned to the proper extent. packing strip 11 thereon isforced into the open end of the can, which end may be then uppermost,until the plunger has entered the can .to an extent that itslouter faceis about flush with that end .of the can remote from the head 2,' Thepacking strip 1l effectively 'prevents any escape' of .grease and thefrictional contact of the packing with the plunger and withthe innerWall of the can is suffcienmto hold the plunger in place during ordinaryconditions of handling.

A gun constructed in the manner deexpense slightly greater than anordinary container' from which the ease must be removed to belaboriously inserted in aV differential gear casing or the transmissiongear' casing of an automobile such casings representing the the greaseis customarily delivered from a'grease gun.

Invorder to discharge the. grease from the upon the nipple cap 4, andthen by pressure'of the ngersof the manipula tor uponthe plunger7 thelatter is slowly -Now the plunger 7 with a of the plunger Where joiningreact head i). and ti 'case is all dischar;q n the can. Tin isaccomplished witln leaking hach around the pin' e suc-'h leal r iseffectively pri-Ye eu'iploycd, and

duc to the presence of costs so little te may be tl'lrown away gy o;V`wary can after being emptied. contents, and, incroci/er,v the gun .is"l as a container for the in the saine manner as an ordinary can, thusdoing away with the necessity of using a container for the storage,transportatin and sale of the grease and a gun'fonihe injection of thegrease into the gear casing.

lhat is claimed is In a container and gun for lubricating grease, aplunger constituting a. Closure for one end of the gun and movabletoward the other end thereof to expel grease therefrom7 said plungercomprising a sheet metal cylinder with heads at the ends completelyclosing the cylinder, the heads and the 'body being formed intocircinntercntial beads of greater radial extent than the cylindricalWalls of the plunger to define a channel between them, and a strip of1li-aching material lodged in the channel for engagement with the innerWall of the gun.

Tn. testimony, that I claim the foregoing as my ownb have hereto affixedmy signature in the presence of two witnesses.

EDWARD RA WSE THOMPSON.

lVitnesses:

Annu: Scnnnl'nnn,

H. D. BILLrnGs.

